How is our body warm/where does the warmth come from?
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I can’t do a true eli5 for this but…
The cells in our body take break down molecules, like glucose – a sugar, and make a high-energy molecule called ATP. It’s this process which helps us generate heat. If you’re cold, you shiver, using some of the ATP and causing the cells to make more. That’s also why, when you exercise, you get hot.
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